fix: Alignment issues with 'unsaved changes' badge in Feature modal

[alveyworld]

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Changes

Closes issue #6935

In the .unread selector, simply changing the bottom attribute to a positive 9px brought the * badge up to vertical center without moving the position or size of the tab.

How did you test this code?

Steps to reproduce

1. Open any feature (Edit Feature modal)
2. Click on the "Segment Overrides" tab
3. Make a change to a segment override (toggle enabled, change value, etc.) — the purple * badge appears
4. Observe the badge is now vertically centered and not overlapping the baseline of the tabs
5. Switch to "Identity Overrides" tab — the badge still shows under the now-inactive "Segment Overrides" tab

I followed these steps to recreate and visually fixed the css issue. I resized the window to extreme small and large sized and the badge remained in place. At smaller sizes it naturally jumps up to the right of the tab.

[claude]

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